Randomly Position MoveClip without Overlapping?

[ScriptAction]

I'm not really sure what would cause the overlap in terms of size. The objects (is that the right word?) are 155 x 69 pixels in terms of size.

I have uploaded my rough file if you want to have a look. Ignore the blue fish, its the orange fish that appear that are randomised.

The code to make them appear is:

var container:Sprite = new Sprite();
addChild(container);
container.x = 300;
container.y = 400;

var food:food_mc = new food_mc();
container.addChild(food);
food.x = Math.random();
food.y = Math.random();

var food1:food_mc = new food_mc();
container.addChild(food1);
food1.x = Math.random()*200;
food1.y = Math.random()*200;

var food2:food_mc = new food_mc();
container.addChild(food2);
food2.x = Math.random()*300;
food2.y = Math.random()*300;

var food3:food_mc = new food_mc();
container.addChild(food3);
food3.x = Math.random()*475;
food3.y = Math.random()*350;

var food4:food_mc = new food_mc();
container.addChild(food4);
food4.x = Math.random()*475;
food4.y = Math.random()*350;

var food5:food_mc = new food_mc();
container.addChild(food5);
food5.x = Math.random()*475;
food5.y = Math.random()*350;

var food6:food_mc = new food_mc();
container.addChild(food6);
food6.x = Math.random()*475;
food6.y = Math.random()*350;

and is in frame 40.

Do you know where I could find someone who could sort this out for me and how much it might cost?

Thanks for your help.